21683419 has 2 divisors, whose sum is σ = 21683420. Its totient is φ = 21683418.

The previous prime is 21683393. The next prime is 21683429. The reversal of 21683419 is 91438612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21683419 - 2²¹ = 19586267 is a prime.

It is a super-2 number, since 2×21683419² = 940341319059122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21683429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10841709 + 10841710.

It is an arithmetic number, because the mean of its divisors is an integer number (10841710).

Almost surely, 2^21683419 is an apocalyptic number.

21683419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21683419 is an equidigital number, since it uses as much as digits as its factorization.

21683419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 21683419 is about 4656.5458228176. The cubic root of 21683419 is about 278.8533849386.

The spelling of 21683419 in words is "twenty-one million, six hundred eighty-three thousand, four hundred nineteen".